the flash message is saved in session, if you redirect it will be displayed after redirection, the render for the flash element should also be in layout by default above the content render, inspect your session with debug_kit after redirect and see if the message is there in SESSION panel

@lorenzo I see. It was at least unexpected, given that the `*JoinWith()` methods are described to not include the data. And the time it took to debug this to figure out what's causing it was indeed a little annoying ;)